As Occupy protests have spread from New York, across the US and around the world, the two big questions have been: who are the protesters and what do they want.

The Guardian thought that one way to answer these questions was to give the protesters the chance to speak for themselves - and to each other, whichever city they happened to be occupying.

We asked three Wall Street occupiers to record a short video message to post on YouTube answering three simple questions: why am I here; what do I hope to achieve; and what would I like to know from other protesters.

Now we want to help build these into a global video conversation between Occupy protesters, a vehicle for individuals to explore and develop ideas for joining the individual protests together and keeping up the extraordinary momentum they have generated already.

Already, Bernie Sanders, the independent senator for Vermont who has been championing many of the causes the Occupy protesters care about for years, has posted his video response to the whyoccupy debate.Occupy Wall Street protester Sara Hake shares her thoughts on YouTube

To join in the conversation and respond to George, Sara, Sidy and Senator Sanders, just upload your video to YouTube using the tag or keyword whyoccupy. Then post the link to the video in the comments below this blog and we'll add them to the whyoccupy playlist on the Guardian YouTube channel.